https://bugzilla.wikimedia.org/show_bug.cgi?id=48835
Web browser: ---
Bug ID: 48835
Summary: Separate Cache-Control header for proxy and client
Product: MediaWiki
Version: 1.22-git
Hardware: All
OS: All
Status: NEW
Severity: enhancement
Priority: Unprioritized
Component: General/Unknown
Assignee: [email protected]
Reporter: [email protected]
Classification: Unclassified
Mobile Platform: ---
MediaWiki has traditionally used the Cache-Control header to control the CDN
(i.e. Squid reverse proxy), then the Cache-Control header for clients has been
specified in Squid configuration. Specifically, when a certain URL regex
matches, the Cache-Control header is stripped out and replaced with the
configured header.
This is not ideal, as noted by Gabriel in a comment in the original code. It
would be better if MediaWiki specified both headers in its response, so that
the URL regex and client Cache-Control header does not need to be maintained in
the CDN configuration. Originally, this would have required a Squid patch, but
now that we are switching to Varnish, the feature can be implemented with VCL.
Specifically, MW should send a Client-Cache-Control header which Varnish will
rewrite to Cache-Control as appropriate.
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